Vacuum-sealing can.



No. 680,999. Patented Au 20, l90l.

, E. nomon.

vAcuuu SEALING CAN.

(Application filed Nov. 8, IQQO.)

:(llo Model.)

THE uonms PETERS co. mum-Lima. wasumm'ou. n, c.

UNITED STATES PA ENT L FFICE.

EDWIN NORTON, OF MAYWIZOOD,ILLINOIS,ASSIGNOR TO THE AUTOMATIC VACUUM CANNING COMPANY, OF CHICAGO, ILLINOIS.

VACUUM SEALING CAN.

SPECIFICATION forming part of Letters Patent N0. 680,999, dated August 20, 1901.

Application filed November 3, 1900. Serial No. 36,317. (No model.)

i To all whom it may concern:

Be it known that I, EDWIN NORTON,a citizen of the United States, residing in Maywood, in the county of Cook and State of Illinois, have invented a new and useful Improvement. in Vacuu m-Sealin g Cans, of which the following is a specification.

My invention relates to improvements in vacuum-sealing sheet-metal cans.

. 10. It consists in a vacuum-sealing sheet-metal ing between the cover and can-body, whereby the filled can after having its cover thus hermetically sealed and secured thereto by the combined vacuum seal and the double seam is adapted to have its contents cooked to any extent required without danger of the internal steam pressure generated in the o sealed can by the cooking operation weaken ing, injuring,(or causing leaks or defects in the joint uniting the cover to the can-body.

In the accompanying drawings, forming a part of this specification, Figure 1 is a cenj tral vertical section of a vacuum-sealing sheet-metal can, showing the cover loosely in place thereon and ready to be hermetically.

sealed thereto in vacuum by placing the filled can in the receiver of a vacuum-pump, 6X hausting the air therefrom and from the can, and then forcing the cover home upon the i, can body and restoring it to atmospheric pressure. Fig. 2 is a similar view showing the cover hermetically sealed and secured to the 5 can body by the vacuum or atmosphericpressure seal; and Fig. 3 is a similar view showing the cover additionally sealed and secured to the can-body by a double seam by folding together the seaming flanges or rims 5o onthe cover and can-body.

In the drawings, A represents the body of a sheet-metal can, the same having a seamin g-fian get a, which also forms a smooth shoulder or bearing a for the packing O, which is compressed between the cover B and canbody. The sheet-metal cover has a flange, shoulder, or guide 6, which fits inside the canbody and causes the cover to properly seat itself both when placed loosely thereon to permit the air and gases or vapors to be exhausted through the open mouth of the can when in the receiver and also when the cover is forced home upon the can to hermetically seal it thereto by the vacuum or atmosphericpressure seal. The packing O surrounds the guide or shoulder 19 and is compressed between the cover and the shoulder or seamingflange ct on the can-body. The cover 13 has also a seaming rim or flange b, which is folded with the seaming-flange a into a double seam Z7 which additionally compresses and holds compressed the packing O and locks and secures the cover to the can with great strength, firmness, and rigidity and in a perfectly unyielding manner. This double seam 39 also securely confines the packing C, so that no internal pressure generated in the sealed can by the subsequent cooking operation can force any pin-holes or even the minutest leaks through the packed joint uniting the cover and can-body.

The vacuum or atmospheric-pressure seal collapses or inwardly curves the cover B, as illustrated in Fig. 3, by reason of the vacuum within the can and the atmospheric pressure on the outside thereof.

I claim- The combined vacuum seal and doubleseam sheet-metal preserving-can comprising a can-body having a seaming-flange at its go upper end forming also a smooth seat or bearing for a packing, and a cover having a packing and a guide flange and hermetically sealed and secured to said can-body by a vacuum or atmospheric-pressure seal, said cover being inwardly curved or collapsed and having also a seaming rim or flange folded into a double seam with said seaming-flange on the can-body; whereby the packed joint uniting the cover and can-body is adapted to Ice resist internal pressure generated in the sealed can 'by subsequent cooking of its contents, substantially as specified.

EDWIN NORTON.

Witnesses:

EDMUND ADCOOK, L. EPCURTIS. 

